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Callus softeners are potent liquid formulas applied to heavy callus areas to soften them for more effective pedicure filing. So what exactly is in these softeners? Here’s a profile of three of the most common active ingredients in callus softeners today.

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Just 26 years old, nail tech Stella Sampson has been working for a cosmetics company since early 2015, after studying chemical engineering at the National Technical University of Athens for five-and-a-half years.

Wondering whether to buy your acetone at the beauty supply or the hardware store? The fact is, acetone is acetone, but some acetone contains small amounts of other impurities, says Doug Schoon, president of Schoon Scientific and co-chair of the Nail Manufacturers Council on Safety.